How recover gmail email i never deleted - years back

Hello, I recently looked for some old gmail emails from 2011, 2012, and the first few months of 2013. I discovered that my email cue ends in MAR 2013, nothing exists prior.

I did some google searches for tips to recover.... the only messages that come up in my search are the ones I my existing folders from MAR 2013 and later.

I never deleted the messages. My yahoo emails are just fine for years prior to 2010...

Any tips very much welcome... Dan